Roller mill



E. B. BECCARIS 2,082,819

- June 8, 1937.

ROLLER MILL Filed Dec. 22, 1935 Patented June 8, 1937 PATENT OFFICE ROLLER MILL Emil B. Beccard, St. Louis, Mo., assignor to The International Printing Ink Corporation, New York, N. Y., a corporation of Ohio Application December 22, 1933, Serial No. 703,527

Claims.

This invention relates to roller mills of the kind used for grinding inks, paints and the like. In this type of mill, the material, after a preliminary mixing, is ground between th-e cooperating surfaces of a plurality of rolls and is scraped from the final grinding roll by means of an inclined apron that serves as a discharge chute for the material deposited thereon. A practical objection to the use of such discharge apron as a roll scraper is that the scraper edge of the apron cannot be set and maintained close enough to the apron roll to remove all of the material there.

from, with the r-esult that the output of the mill is decreased, part of the material is unnecessarily reground and the operation of washing up to change from one color or material to another is rendered difficult.

The present invention has for its principal objects to provide the mill with a scraper that will remove substantially all of the material from the final grinding or apron rolland thus overcome all of the disadvantages hereinbefore mentioned. Another object is to provide a simple and eiiicient adjustment for maintaining the scraper in contact with the grinding roll throughout the length thereof.` Another object is to provide for the ready removal and replacement of the scraper without changing its adjustment. Other objects are simplicity and cheapness of 30 construction and compactness of design. The invention consists in the roller mill and in the construction, combinations and arrangements of parts hereinafter described and claimed.

In the accompanying drawing, which forms part of this specification and wherein like symbols refer to like parts wherever they occur,

Fig. l is a front elevation of a roller mill provided with a, roll scraper embodying my invention,

Fig. 2 is a fragmentary vertical cross-section on the line 2-2 in Fig..1,

Fig. 3 is a similar section on an enlarged scale,

Fig. 4 is a fragmentary section on the line 4-4 in Fig. 3,

Fig. 5 is a fragmentary section on the line 5 5 in Fig. 3; and

Fig. 6 is a fragmentary plan View of the blade holder therefor.

Referringto the accompanying drawing, my

invention is shown in connection with a roller 50 mill of the kind used for grinding inks, paints and the like. Said mill comprises a suitable frame A in which is journaled a multiplicity of grinding rolls, of which only the final grinding or apron roll B is`shown. The mill is provided with the 55 usual discharge apronC adapted to receive the ink from the apron roll B. The discharge apron C is disposed in front of the apron roll at a suitable angle thereto and is supported at its opposite sides by means of suitable brackets that project from the roll supporting frame A of the 5 mill.

According to the present invention, the ink is removed from the apron roll B by means of a scraper device or attachment that extends longitudinally of the apron roll between the upstanding side walls l of said apron. Said scraper device comprisesa thin, flexible steel scraper blade D whichprojects from the rear edge of a holder that is provided at its opposite ends with laterally extending arms 2 that are mounted on horizontal pivot pins 3 that project inwardly from end plates 4 that are bolted or otherwise removably secured flatwise to the upstanding side walls I of the discharge apron C. By this arrangement, the holder E may be swung towards and away from the apron roll B to move the cutting edge of the blade D into and out of engagement with the surface of said roll. In the operating position of the device, the blade overhangs the downwardly moving frontside of the roll with its cutting edge g5 resting thereon and with the blade and holder inclined downwardly and forwardly to position the blade at the proper working angle and to permit the ink to flow across the holder and drip 01T the front edge thereof into the discharge apron C. The holder is held against movement lengthwise of its supporting pins 3 by set collars 5. When these collars are loosened, the holder may be disengaged from the pins by shifting the holder endwise far enough to disengage the arms from said pins.

The holder E comprises upper and lower sections 6 and 'l between which the flexible scraper blade is positioned. The two sections of said holder are drawn together to clamp the blade therebetween by means of clamping screws 8. The holder is provided along its front edge with a series of longitudinally spaced screws 9 which bear against the back edge of the blade and serve as stops for limiting the rearward movement of the blade in the holder and as a means for properly positioning the cutting edge thereof relative to the roll surface.

The flexible cutting or scraping edge of the blade D is held down upon the roll surface by means of a clamping bar F that extends from end to end of the blade holder E and is preferably located thereabove with its ends extending beneath the inwardly extending free upper end portions Illa of arms Il) that are pivoted at Il to the end plates 4. The clamping bar is detachably secured to the overhanging ends Ilia of the arms I0 by means of screws I2 that are threaded through said ends and extend loosely through the ends of the clamping bar F with their ends bearing against the bottoms of short longitudinal grooves I5 provided therefor in the upper surface of the blade holder. 'I'he clamping bar F is provided intermediate its ends with a series of longitudinally spaced adjusting screws I3 that are threaded through said bar with their ends in abutting relation to the upper surface of the blade holder E. By adjusting these screws. the scraper edge of the flexible blade may be made to conform to the grinding surface of the roll. 'I'he blade holder is provided at its ends with upstanding plates I6 that converge inwardly and downwardly and serve as baffles for preventing the ink from coming in contact with the supporting arms of the knife holder and clamping bar and the pivots therefor.

The hereinbefore described roll scraping device has numerous advantages. It may be readily incorporated in existing types of roller mills, and it may be quickly and easily removed and replaced without changing its setting; it provides continuous contact between the bla-de and the roll surface and thus increases the output of the mill; it greatly simplifies the operation of washing the rolls; and it provides a simple and efiicient means for adjusting and clamping the scraping knife in the holder.

Obviously, the hereinbefore described construction admits of considerable modification without departing from the invention. Therefore, I do not wish to be limited to the precise construction shown and described.

What I claim is:

1. A roller mill comprising a grinding roll, a discharge apron adapted to receive material from said roll, and a scraper device for removing said material from said roll, said scraper device comprising a flexible scraper blade adapted to engage the grinding surface of said roll, a holder for said blade pivotally secured to said machine for swinging movement towards and away from said surface, means for holding said blade in contact with said surface throughout the length of said blade, said means comprising a bar located above and extending longitudinally of said blade holder, a plurality of longitudinally spaced screws threaded through said bar in abutting relation to the upper surface of said blade holder, a plurality of screws threaded into said blade holder in abutting relation to the rear edge of said blade, and means for securing said bar to said machine.

2. A roller mill comprising a grinding roll, a discharge apron adapted to receive material from said roll, and a scraper -device for removing said material from said roll, said scraper device comprising a iiexible scraper blade adapted to engage the grinding surface of said roll, a holder for said blade pivotally secured to said machine for swinging movement towards and away from said surface, means for holding said blade in contact with said surface throughout the length of said blade, said means comprising a bar 1ocated above and extending longitudinally of said blade holder, a. plurality of longitudinally spaced screws threaded through said bar in abutting relation to the upper surface of said blade holder, and means for removably securing said bar to said machine, said securing means comprising arms pivoted to said machine for vertical swinging movement transversely of said holder with their free ends secured to the ends of said bar.

3. A roller mill comprising a grinding roll. a discharge apron adapted to receive material from said roll, and a scraper device for removing said material from said'roll, said scraper device comprising a flexible scraper blade adapted to engage the grinding surface of said roll, a holder for said blade pivotally secured to said machine for swinging movement towards and away from said surface. means for holding said blade in contact with said surface throughout the length of said blade, said means comprising a bar located above and extending longitudinally of said blade holder, a plurality of longitudinally spaced screws threaded through said bar in abutting relation to the upper surface of said blade holder, and means for removably securing said bar to said machine, said securing means comprising arms pivoted to said machine for vertical swinging movement transversely of said holder with their free ends secured to the ends of said bar, said last mentioned securing means comprising screws threaded through said arms and extending loosely through said ends of said bar with their ends in abutting relation to said blade holder.

4. A roller mill comprising a grinding roll, a discharge apron adapted to receive material from said roll, and a scraper device for removing said material from said roll, said scraper device comprising a. flexible scraper blade adapted to engage the grinding surface of said roll, a holder for said blade pivotally secured to said machine for swinging movement towards and away from said surface, means for holding said blade in contact with said surface throughout the length of said blade, said means comprising a bar extending longitudinally of said blade holder, a plurality of longitudinally spaced screws threaded through said bar in abutting relation to said blade holder, means for removably securing said bar to said machine, said means comprising arms secured to said machine,'and screws threaded through said arms and extending through holes in said bar in abuttingrelation to said blade holder.

5. A roller mill comprising a grinding roll, a discharge apron adapted to receive material from said roll, and a Scraper device for removing said material from said roll, said scraper device comprising a flexible metallic scraper blade adapted to engage the grinding surface of said roll, a

holder for said blade, said blade holder being y provided adjacent to its end with laterally extending arms, horizontal pivot pins extending inwardly from opposite sides of said apron and pivotally supporting said arms, means for holding said blade in contact with said surface throughout the length of said blade, said means comprising a bar extending longitudinally of said blade holder, a plurality of longitudinally spaced screws threaded through said bar in abutting relation to said blade holder, and means for removably securing said bar to said machine, said means comprising arms pivotally secured to said apron, and screws threaded through said arms and extending through said bar in abutting relation to said blade holder.

EMIL B. BECCARD. 

